function reinitIframe(){ 
var iframe = document.getElementById("frame_content"); 
try{ 
var bHeight = iframe.contentWindow.document.body.scrollHeight; 
var dHeight = iframe.contentWindow.document.documentElement.scrollHeight; 
var height = Math.max(bHeight, dHeight); 
iframe.height =  height; 
}catch (ex){} 
} 
window.setInterval("reinitIframe()", 200);